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Hard and long would have done it. These things are random. Could have been minute flaw or crack in the piston top that caused a hot spot. If there's no vacuum leaks and the air fuel mix is good then it should be good from now on. On the Dyno did they test the mix on light load constant throttle? Might be a lean moment in there?
TRA
No, the pistons had less than 8000 miles on them. Ginger beard hair is a working theory.
I am minded toward the defect explanation to be honest. Either a manufacturing defect or a previous spot of lean running that caused a defect.
I then drove it hard and long (ooh errr missus) on a hot day which caused it to let go in relatively catastrophic fashion.
I don't suppose I'll ever know and I also don't think I'll be doing sustained periods of 5k rpm and up anymore. No problem really as I have figured out how to tune the ancient radio into Steve Wright in the afternoon, so 75mph in overdrive should suit me just fine. String backed driving gloves anyone?